Cellulose Quantitative Filter Paper, Grade DFA41, Fast, 20-25um, 150mm, Ashless, 100/Pk
GVS SKU: FP150DFA41QANC01

Featuring an ashless cotton linters medium with virtually 100% alpha-cellulose content, this Grade DFA41 quantitative filter paper delivers fast filtration with a nominal particle retention of 20 to 25 microns. Each circle measures 150mm in diameter, with a nominal thickness of 190 microns and a basis weight of 85 g/m squared. An ash content of less than 0.007% makes it well suited to gravimetric and quantitative analysis where the precipitate is ashed and a clean ignition residue is essential.

Key Cellulose Media Characteristics

• Hydrophilic cotton linters medium with virtually 100% alpha-cellulose content for high purity
• Coarse 20 to 25 micron nominal retention, the fast-flow end of the quantitative ashless range
• Ash content below 0.007% supports accurate gravimetric and ignition-residue work
• Fast filtration speed handles coarse particles and gelatinous precipitates such as iron or aluminum hydroxides
• 190 micron nominal thickness provides depth loading and mechanical strength for Buchner funnel and pressure filtration

Key Construction Characteristics

• Circular format, 150mm diameter
• Nonsterile
• Packaged 100 discs per box
• Refined pure cotton linters construction suited to Buchner funnels and filtration under pressure

This grade maintains consistent flow and retention across routine quantitative workflows, protecting sample integrity through its high-purity, low-ash composition. Its fast filtration speed and coarse retention make it a dependable choice for high-throughput gravimetric analysis and environmental sample preparation.

Diameter

150mm

Flow Speed

Fast

Grade

DFA41

Material

Cellulose (cotton linters)

Mesh Format

Circle

Nominal Ash Content (%)

<0.007

Nominal Basis Weight (g/ m²)

85

Nominal Thickness (µm)

190

Pack Count

100

Particle Retention

20-25 µm

Pore Size (µm)

20-25

Qualitative/ Quantitative

Quantitative

Sartorius Equivalent

Grade 5A

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 41

• Gravimetric Analysis The ashless, low-residue cellulose collects coarse precipitates for accurate gravimetric determination after ignition.
• Coarse and Gelatinous Precipitate Filtration Fast flow and 20-25um retention suit difficult precipitates such as iron or aluminum hydroxides.
• Air Pollution Monitoring Suitable for quantitative air pollution analysis as an impregnation paper tape for collecting gaseous compounds at high flow rates.
• Soil and Sediment Sample Preparation Fast filtration speed handles heavily loaded soil, sludge, and sediment samples for metals analysis after acid digestion.
• Buchner Funnel and Pressure Filtration The 190um thickness and mechanical strength withstand vacuum and pressure filtration setups.
• High-Throughput Sample Clarification Coarse porosity and fast flow maximize throughput where moderate retention is acceptable.